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Method for efficient 4-point software for touch screen calibration

Publishing Venue

Abstract

Disclosed is a method for efficient 4-point software for touch screen calibration. Benefits include improved usability.

Country

United States

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
44% of the total text.

Method for efficient 4-point software for touch screen
calibration

Disclosed is a method for efficient 4-point software for touch
screen calibration. Benefits include improved
usability.

Background

� � � � � Handheld devices with touch screen capability contain a
digitizer that reads the raw X and Y coordinates of the point
where a stylus has touched the screen panel. A touch screen driver converts the
raw X and Y point into X and Y pixels, called GuiX
and GuiY, which are used by the kernel and the GUI (see Figure 1). The problem with the reporting of the raw
points by the digitizer is that the screen on some hardware appears to be
skewed. The fact that some screens appear more skewed than others can be
directly attributed to the variability in manufacturing.

For example, raw P1(x)
should be the same as raw P2(x), theoretically. However, in reality raw P2(x)
could be less or more than raw P1(x) (see Figure 2).

� � � � � Conventional solutions use a 3-point solution at three corners
to translate the raw points into GUI points. While this solution can be
accurate in three corners of the screen, the fourth corner is most likely
miscalibrated, yielding bad translation.

Description

� � � � � The disclosed method is an efficient 4-point software
for touch screen calibration. The method
translates raw points to GUI points accurately and efficiently. A series of
equations describe the translation of the points:

First, start with the equations needed to calculate GuiX.

Define Left as the line that describes the leftmost
vertical skew of the screen as reported by the digitizer. See Figure 2. Eq(1)
shows how to find that line equation.